(1R,3aS,5aR,5bR,7aR,8R,9R,11aS,11bR,12R,13aR,13bR)-9,12-Dihydroxy-8-hydroxymethyl-1-isopropenyl-5a,5b,8,11a-tetramethyl-icosahydro-cyclopenta[a]chrysene-3a-carboxylic acid methyl ester 在
吡啶 、
sodium methylate 作用下,
以
甲醇 为溶剂,
反应 13.5h,
生成 (1R,3aS,5aR,5bR,7aR,8R,9R,11aS,11bR,12R,13aR,13bR)-12-Acetoxy-8-acetoxymethyl-9-hydroxy-1-isopropenyl-5a,5b,8,11a-tetramethyl-icosahydro-cyclopenta[a]chrysene-3a-carboxylic acid methyl ester